In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

Can you count the number of squares in the figure below?

Can you count the number of triangles in the given picture?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

A devotee visits 9 temples when he visits India. All these nine temples have one thing in common - there are 100 steps in every temple. The devotee puts the Re.1 coin after climbing up every step. He does the same while climbing down every step. At each temple, the devotee offers half of his money from his pocket to god. In this way, his pocket becomes empty after he visits the 9th temple.

Can you calculate the total amount he had initially?

Can you find out the missing number in the grid?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What seven-letter word has hundreds of letters in it?